Self-opening die.



No. 895,636. PATENTED AUG. 11, 1908.

E. G. HENN.

SELF OPENING DIE.

APPLICATION FILED JULY 1,1905.

3 SHEETSSHEET 1.

Ly s/ Elm 895,636. PATENTBD AUG. 11, 1908.

-E.C.HENN.

SELF OPENING DIE.

' APPLICATION FILED JULY 1, 1905.

3 SHEETSSHBBT 2 v 11 a a 3 (7 1 723,-

PATENTED AUG. 11, 1908.

E. C. HENN. SELF OPENING DIE.

APPLICATION FILED JULY 1, 1905.

3 SHEETS-SHBET 3.

UNITED snares earns enrich.

EDWIN C. HENN, OF CLEVELAND, OHIO, ASS [GNOR TO TH E NATIONAL-ACME MANUFAGTURING COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

SELF-OPENING DIE.

No. 895,636. Specification of Letters Patent. Patented Aug. 11, 1908.

Application flied July 1, 1905. Serial No. 267,968.

To all whom it may concern: I tion of the machine showing the means for Be it known that I, EDWIN C. HENN, a operating the die and its jaws. Fig. 11 is a citizen of the United States, residing in front elevation. Fig. 11 a side elevation of Cleveland, in the county of Cuyahoga and the parts shown in Fig. 10. Fig. 13 is an State of Ohio, have invented certain new and elevation enlarged from the opposite side; to useful Improvements in Self-Opening Dies, and Fig. 14 is afragmentary view similar to of which the following is a specification. Fig. but enlarged. This invention has reference to devices for In the embodiment of my invention shown cutting threads on rods or other stock in main the drawings, on a shank 15, is suitably se chine tools, especially of the class known as cured a head 16; which members may have turret lathes or automatic machine tools, an axial bore 17, to accommodate the stock, wherein at the proper stage, the device is if desired: To the head 16 are pivoted a pluclosed and advanced relative to the stock to rality of tool holders or jaws, two being form thet-hread, and thereupon automaticshown in the present instance, but obviously ally the cutting members in the device swing a greater number might be provided; all of out away from the threaded stock, so that which are mounted on pivots to swing to there is no necessity for reversing either the -ward and from the axis of the head. Each stock or the die to remove the tool from the of the tool holders is shown as comprising a Car threaded stock. block 18, from which projects an arm 19,

One of the objects of the invention is to having an aperture 20. On opposite sides provide means for automatically and posithe head is provided with a slot 21, extendtively moving the holders or jaws in the deing radially, in which snugly fits the apervice, both to and from, their operative posi-- tured arm 19, pivoted therein by means of a tion. pin 22, passing through an aperture 23, in

Another object of the invention is to prothe lead and through the aperture 20, in the vidc a form of tool holder or jaw by which said arm. The block 18, has a slot extendstandard stock die segments or chasers can ing from one end to thoothcr thereby l'orm be securely and. adjustably mounted in the ing side members 24., that are preferably unholders, and particularly the stock button der-cut, forming a dove-tailed slot. In such dies. slotted portion of the block is snugly fitted a Another object of the invention is to proplate or slide 25, havingits side walls corrovide means for properly adjusting such spondingly tapered to ei'igage the under-cut chasers to and from the cutting line after side member. they have been securedi'n the holder. In order to suitably clamp a chaser or die A further object of the invention is to prosegment 14 of the usual semi-circular form as vide a means for operating the chaser-"jaws shown in Fig. 5, the block 25, is provided that is independent of the movement oi the with semi-circular recess 26 in its face at one die in the tool carrier or of the movement of end, of approximately the same outline as such carrier. the chaser 14, but of less depth than the In the drawings accompanying and tormthickness of the chaser. A clamping plate ing a part of this specification showing one 27, has an elongated central opening 28, embodiment of my invention;Figure 1 a larger than the shank of a bolt 29, that perspective view of the device, one of the screws into a threaded hole 50, in the block holders being removed. Fig. 2 shows the ad- 25. Bv this means the plate 27, can be justing plate. Fig. 3 shows the clamping clamped on the block 25, in a number of screw. Fig. 4. shows one tool holder rcpositions and secure the chaser in the removed. Fig. 5 shows a dic-scgment or 'cesscd portion. The plate 27 has at one end chaser. Fig. 6 shows holder having a a pair of opposite lugs 31, that extend from chaser formed integral therewith. Fig. 7 the uppcreud oi the date, and by thciriunor shows in plan the cam member and the cofaccs engage the cmi portions ot the diameoperating portions of the tool holders. l ig. tral face of the chaser. At its opposite end, S shows the device partly in elevation, and the plate of has a lug 32, projecting into a partly in longitudinal section. Fig. 9 is a slotted end portion 33, of the block; the section of the cam member on line a d oi latter lug being provided with a threaded Fig. 8. Fig. 10 is a vertical section of a poraperture in which screws an adjusting bolt su aces the en clock and of the plate such screw will est-use the plate to tightly clsmp "he chaser in the reccised part of the block. Ti lie chaser having been thus secured in the recess the slidnhle block 25, is adjusted, toward the cutting line by means of screws 36, located in threaded apertures in a. cross secured to the block at one end. djustcd in proper position, the slide is elem ed in this by means ol screws 38, in one side of the holder that engage one of the sliding feces oi? the block; which'may be grooved desired {LS shown at 39 in Fig. 6.

molt shaped.

While means are shown for clamping a substentially semi-circular chaser, it is obvious that other forms can be secured to the block by suitably altering the shape of the retherein correspondingly. if desired, L chaser and sliding block 25, may he mode the member 40 shown in integral, such as l G, in which case the clamping plate .27 is dispensed with.

For the simultei'ieous opening;

and closing oi the (ll-l16lil915, is provided a double ceni member ll thet'rocus on the shank 15, ad acent to the head. The cam member hes opoositely exteu-zling cam arms 42, somewhat On each said holder is suit,- ohly secured her 4.3, having at its extremity oller :45, arranged toengzige with the inner lace il'll oi" one of the cam arms oi the cam is eccentric,

the i \'i-. 1g of cam member will it cause the cam arms to rock the die 2 on their pivot pin. 22, moving, them "from the stock. To return the die. holders to llJQlZ' tmcretive position, a bolt 4-5, screwed into a threaded aperture in the extremity of each arm arranged to engage e cam face 46, on the cam member, there being two such cums, diametrically opposite on the mcmher, for sin'iultzmcous engagement with the bolts 4.3. By this in ens, the swinging ol the cum member in one dircclion w'll cause its ems lZfcngnging the rollers 44, to thereby move the die segments outward. find the swinging of the emu member in thc o;,\posiic directi n. hy the engagement of the bolts 4;"). wii l! the cum faces 46, will cause the die segments to swing inward to their operatng position. it will be noticed that the cams 42, lmvc :1 gradual curvature, whcrch v' tively elin'upt,-serving to swing the holders quickly to their operative position. And the bolts 45, thereupon engage a, concentric face 4-7, on the cum member, serving to retain the holders in their operative position. By the adjustment of these bolts 45, the wear on them and their cooperating faces is comiensated for, so that the die segments can be accurately adjusted to cut the proper depth ol thread. Additional means are also provided for limiting the movement of the holders to the operative position, comprising a. pair of screws 48, tapped into the end of the heiid, that form ebutments for the adj 1- cent faces of the heads. Thesebolts are locked in position by means of set Screws 49, in the head.

In. Figs. 10 to I l are shown one form of means for operating the cam member of the lathe. On the bed 50 of the machine is mounted a tool carrier 51, slideble in ways 52ftoward and from the stock carrier, not shown.' The shank :15 of device, applied to a screw the die holder is supported in an aperture in v the carrier 51, and has limit-ed sliding move ment therein, being held normally in the position shown in Fig. 11 by a coil spring" 53 on the shank, that permits the die to advance a short distance toward the stock, which is the usual construction in such devices, so that the die can follow the thread tester than it is being fed, ii. necessary. A slide 54 is movable in a guide 55 secured to the frame 50 The" upper end of the slide is bent transversely and carries a rod :56 extending parallel wit j the shank This rod 56 is arranged to ex tend between the :trms of the forked BXi-IBfllr ity of an arm 57 extending radially from the cam member 41. In the position of these parts shown in Fig. 10, the slide is in its lowermost position, and the die is closed. The slide is prevented from moving downward from such position by a stop pin 58 that engages the end of the guide 55. If the slide is moved upward from this position the bar will roe; the forked arm 57 and thereby cause the jaws of the die to open. And upon being returned to its former position the slidc. will move the bar 56 to again rock the com member and close the jaws. ince the bar 56 n'ojects through the forked arm in a direction parallel with the path of movement of the. carrier 51 supportingthe die member,it

will be seen that the die member can move through a, considerable range without effecting'iis control by the bill 56 and slide; and the position of the die segments relative to thcir supporting llOlUl is independent of any longitudinal movement of the carrier. The segments will be opened or closed by the proper movement of the slide, irrcspective oi the position of the carrier within its range of lougitudinzd movement.

Suitable menus iLl'C provided for reciprocullng the slide at the propccstzige in the releasing it from the threaded stodk.

operationof the machine. In the drawings the slide is shown as pivoted to a lever 59 that IS fulcrumed on a bar 61) secured to the frame 50. A pin 6] is secured to the lower end of the slide 54 and is arranged to be engaged by a roller 62, mounted on a drum 63 that is rotated from the main shaft of the machineby any suitable means, not shown. On the free extremity of the lever 59 is mounted a bolt 64, which portion of the lever is preferably bent as indicated in Fig. 14, to inc-line the boltto extend radially of the drum 63. A second roller 65 is also mounted onthe drum 63, and at the proper stage 'engages the bolt 64, and rocks the lever 59, advancing the slide 54. These rollers 62 and 65 are so arranged relatively on the drum 63, that'atthe roper stage, the roller 65 moves the engagml bolt 64 and operates the lever and' slide to move the 'aws from their normal open position to the cl osed position. Thereupon the die and stock are relativelyadvanced, and the stock rotated to cut the thread; as soon as the thread is cut, the pin 61"is engaged by the roller 62 to move the slide 54 upward and quickly open the die, It will be observed that this opening movement of the die segments is independent of any longitudinal movementof the die, and is positively accomplished as soon-as the thread is cut, thereby obviating any necessity of retracting relatively the die and stock. This construction will also overcome the disadvantages of spring movements generally used to retract the die segments or aws. At the same time the die has a limited movement on the carrier controlled by the spring 53, so that the die can follow the thread if necessary. But this latter movement will not effect in any way the opening of the die jaws by the slide and forked arm of the cam, since the latter operate precisely the same' notwithstanding this movement of the die.

Having thus described my invention what I claim is:

1. In a die, the combination of a hcad,a luralityl of jaws pivoted on the head, means or securing a die-segment on each jaw, coinj/rising a' block having a recess at one end portion that has one wall arranged to engage one side of the segment and which recess has a wall shaped to cngagc one edge of the sigment, at p ate engaging the othcr side of the segment and having projccting arms engaging the edge of the segmcnt adjacent its ends, said plate having a lug on its othcr cnd con taining a threaded apcrturc, a bolttin such apcrturc in the lug cngaging the block to force said pair of arms into cngagcmcnt with the segment, and means for forcing the plate and block together to clamp the segment thcrcbctwccn.

2. In a nuichine tool, the combination of a tool carrier, a die member mounted on the carrier, die-segments movably carried on the die mcn'ibcr to open and close, a guide member fixed on the frame of the machine, a slide movable in the guide member, a driving shaft, means actuated from said.shaft for reciprocating said slide, and means for effecting the movement of the die segments in both directions by said slide.

3. In a machine tool, the combination of a tool carrier a die member mounted on the carrier, die-segments on the die member movable to open and close, a member movable on the die member to operate the die-segments in both directions, a slide arranged to engage the latter operating mem ber, a guide fixed on the frame of the machine in which said slide reciprocates, a driving shaft, a rotary member driven from said shaft, and a. pair of projections on said rotary member arranged to alternately connect with said slide to reci )rocate it and thereby effect the opening ant closing of the die segments.

4. In a machine tool, the combination of a tool carrier movable on the frame to and from the stock carrier, a die member mounted on the carrier, die segments movably carried on the die member, a controlling member arranged to operate the die segments to open and close, a fork projecting from the controlling member, a guide fixed on the frame of the machine, a slide arranged to reciprocate in the guide, an arm fixed to the slide and extending parallel with the path of movement of the tool carrier and located in said fork, adriving shaft, a drum rotated from said shaft, and a pair of projections on the drum arranged to alternately connect with and operate said slide, whereby the diesegments are positively operated irrespective of the position of the carrier and die member throughout its range of operative movement.

5. ln a machine tool, the combination of a tool carrier movable on the frame to and from the stock carrier, a die member moun ted on the carrier, die-segments movably carried on the die member, a controlling member arranged to opcratc the die-segments to open and close, a fork proccting from the controlling membcr, a guide fixed on the frame of the machine, a slide arranged to reciprocate in the guide, an arm fixed to the slide and extending arallcl with the path of movement. of thc todl carrier and located in' said fork, a lcvcr fulcrumcd on the frame and pivoted to the slidc, a driving shaft, a drum rotated from said shaft, and a pair oljprojections on the drum arrangcd to alternately connect with and operate said lever, whereby the die segments arc. iositivcly operated irrespective of the position of the die member throughout its range of operative movement.

6. The combination of a driving shaft, 0. carrier supported for longitudinal movement, a head thereon, a plurality of swinging die carrying jaws on said hcad, means swinging said swinging means and rier' supported for iongitndinal movement, a

head thereon, a plurality of swinging die-can rying jaws on said head, meansswinging in a piane transverse to. the plane of movement of said carrier and operativeiy connected with said jaws to positiveiy open and close them, and means supported free of said movable carrier and operated by said shaft and operatively connected with said swinging means for operating it to open and close the jaws.

S. The combination of a cam shaft, a carrier supported for'longitudinai' movement, a head thereon, a plurality of swin ing die-' carrying jaws on said head, a cam or opening and closing said jaws and supported to swing in a plane transverse to the plane of movement of the carrier, means supported free of the carrier and operated by said shaft and 'operatively connected with said swinging cam for positively opening and closing the aws;

9; The combination of a driving shaft, a carriensupported for longitudinal movement,

aheadthereon, a plurality of swinging die earrying jaws on said head, and means opermeans and also movable in a ated by said shaft for opening and closing said 'aws and comprising a slide liavin a mem er extending lengthwise of the head, a support for said slide, and means operatively connecting said slide with said jaws and comprising a member movable on said length-.

wise extending meinher.

10. The combination of a shaft, a carrier supported for longitudinal movement, ahead thereon, a plurality of swingingv die-carrying jaws on said head, swinging means supported for movement in a plane transverse to the plane of movement of the carrier and operatively connected with said jaws, and means in constant engagement with said swinging lane transverse to the plane of movement 0' the carrier and fixed against movement inthc direction of movement of said carrier and operated from saidshaft for operating said swinging means to positively open and close the ews whatever he the longitudinal position of the carrierl v 11. In a machine of the class specified, the combination of a head having a lurality of swinging die carryingjaws, eao having a dovetailed recess, a die carryingihlo'ck movably supported therein, a clam ing plate for securin said die carrying bloc in position, means tor clamping the gether, and means rying block in its dovetailed recess.

EDWIN C. HENN.

Nitnesses:

W. R. MITCHELL, V. O. ERNST.

plate and block tofor admsting the die car- I 

